1) range-stretch acoustic imaging
距离-伸缩声成像
2) distance of stretch out and draw back
伸缩距离
1.
On the basis of the theory of electromagnetic test the paper researchs a new electromagnetic testing method which is not only fit for testing the distance of stretch out and draw back of the piston rod of hydraulic support working under the mining pit but also for the linear constants of the mechanical equipments working on the groun
基于电磁检测原理,探讨了一种适合于检测工作在煤矿井下的液压支架的活塞杆伸缩距离的电磁检测新方法。
3) range imaging
距离成像
1.
This paper introduces firstly the algorithm for Synthetic Aperture Radar (SAR) range imaging in time-domain compression.
首先介绍了SAR时域压缩距离成像算法,同时研究了匹配滤波成像算法。
4) imaging distance
成像距离
1.
The quantity relationships of imaging distance and quality of the system with the main system parameters such as the scattering angle of light beam, the visual angle and open time of gate of receiver are calculated.
提出了一种新型水下激光成像系统的模型 ,计算了该系统的成像距离和成像质量与光束发散角、接收视场角、快门开启时间等主要参数的关系 ,降低背景光的影响与提高光脉冲质量能有效地提高成像距离和成像质量。
2.
Based on the beam spread and the point spread functions, the quantitative relationships of imaging distance and imaging quality with target distance,receiver field angle, facula size and light power in ordinary sea water medium for synchronous scanning underwater laser imaging system are calculated.
利用光束扩展函数和点扩展函数，计算了在一般海水介质中，同步扫描水下激光成像系统，成像距离和成像质量与目标距离、接收视场角、光斑的大小和光功率等参数之间的数量关系。
3.
This paper calculates the irradiance of signal light reflecting from the object and backscatter light at the place of receiver by two flux irradiant transmiting theory and scattering theory of collimated light beam,and obtains the theoretical value of underwater laser imaging distance.
利用双流辐射传输理论和准直光束的散射理论分别计算出接收端目标反射光信号和背向散射光的辐照度，从而得出水下激光成像距离的理论值。
5) synthetic range profile
合成距离像
1.
Moreover,the synthetic range profile and the imaging results of real data are given in this paper.
介绍了线性调频步进信号的形式及合成高分辨距离像的原理,提出了一种基于该信号形式拉伸处理的地杂波剔除方法,分析了目标运动以及雷达载机振动对合成的一维距离像的影响等问题,给出了合成距离像的仿真结果以及一种毫米波直升机机载成像雷达的实测数据成像结果。
2.
The influence of target motion on synthetic range profile was discussed and simulated.
研究了脉间 Costas FH雷达中用逆离散傅里叶变换 (IDFT)进行信号处理的过程 ,分析了脉间 Costas FH雷达信号不存在距离 -速度耦合的原理 ,讨论并仿真了目标运动对合成距离像的影
3.
With matrix theory and DFT theory,the mathematic principle and Doppler effect are investigated for synthesizing range profile of a target with micro-motion,which demonstrates that the traditional maximum quadratic phase error criterion does not exactly represent the effect of motion on synthetic range profile.
首先给出了微动目标合成宽带信号回波的一般模型,利用矩阵理论和离散傅里叶变换理论分析了微动目标合成距离像的一般数学原理和多普勒效应,证明了传统的最大二次相位误差准则不能精确地表征运动对距离像的影响,提出了新的距离像畸变度量指标,并给出了关于新准则的几个有用的结论,对步进频率信号进行了具体分析,最后给出了仿真计算,证明了理论分析的结论。
6) standoff imaging
远距离成像
1.
This thesis mainly focuses on the continues wave(CW) THz standoff imaging technology, analyzes a few critical questions from theoretical and experiment aspects, more concerned with the applications of CW THz standoff imaging technology, which are very essential to further research and exploration.
本论文主要是围绕连续THz波远距离成像技术展开,从理论和实验的角度分析此技术的一些关键问题,论证了连续THz波远距离成像技术的可应用性,对今后深入的研究和探索有一定的借鉴意义。
补充资料：成像距离
要了解摄像头的成像距离需要引进一个超焦距的概念。超焦距是指对焦点以后的能清晰成像的距离。摄像头一般都是利用了超焦距的原理，即短焦镜头在一定距离之后的景物都能比较清晰成像的特点，省去对焦功能。当然这个“清晰”不是一个绝对的概念，超焦距范围内的景物并非真正的清晰成像。由于景物不在对焦点上，因此模糊是肯定的，只是模糊的程度一般人能够接受而已。
摄像头成像距离就是指摄像头可以相对清晰成像的最近距离到无限远这一范围。例如有的摄像头其成像距离是5cm到无限远，即表示5cm是最近的成像距离，此距离以后的景物都会是相对清晰的。对于一般用户来说，如果只是安装在电脑上进行视频聊天的话，那么一般5cm到无限远的“超焦距”模式对焦已经可以满足要求了。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条